7 Constitutional Isomers Of The Cycloalkane With The Forumla C6h12

1) 1,2-dimethylcyclobutane
2) 1,3-dimethylcyclobutane
3) methylcyclopentane
4) 1-ethyl-2-methylcyclopropane
5) isopropylcyclopropane or cycloisopropylpropane
6) cyclohexane
7) 1,2,3-trimethylcyclopropane

What do you guys think